code: def test_can_use_cub_oversize_input4(self):
      # partial reduction with too many (2^31) blocks
      mem = memory.alloc(100)
      a = cupy.ndarray((2**31, 8), dtype=cupy.int8, memptr=mem)
      b = cupy.empty((), dtype=cupy.int8)
      assert self.can_use([a], [b], (1,), (0,)) is None
  
imports: from itertools import combinations
  import unittest
  import sys
  import cupy
  from cupy import _environment
  from cupy import testing
  from cupy._core import _accelerator
  from cupy._core import _cub_reduction
  from cupy.cuda import memory
label_desc: Use image node_id 8 for calling the TestSimpleCubReductionKernelMisc obj's underlying member method code with example usage: obj.test_can_use_cub_oversize_input4() without return types